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Challenges and perspectives of ionic liquids vs. traditional solvents for cellulose processing
Umeå University, Faculty of Science and Technology, Department of Chemistry. (Technical Chemistry)
Umeå University, Faculty of Science and Technology, Department of Chemistry. (Technical Chemistry)
Umeå University, Faculty of Science and Technology, Department of Chemistry. (Technical Chemistry)
2012 (English)In: Handbook of ionic liquids: properties, applications & hazards / [ed] Jihoon Mun, Haeun Sim, New York: Nova Science Publishers, Inc., 2012, 1-34 p.Chapter in book (Refereed)
Abstract [en]

It is commonly accepted that world-wide production of oil, coal and natural gas will eventually come to a halt, although we still heavily depend on these non-renewable feed stocks and their associated chemical derivatives. Therefore, new, sustainable resources for the production of industrially important chemicals are required. Biomaterials offer much promise in this regard, since they generally contain a lot of cellulose which can be transformed and potentially provide a great source of industrially important chemicals. Presently, only a small part of the annual biomass growth in the world is utilized by industry, while the rest is decaying along natural pathways. In order to effectively process cellulose, it needs to be dissolved in some liquid medium. Present state-of-the-art commercial technologies employ very toxic and hazardous processing with volatile organic solvents like CS2. However, this need not be the case. Ionic liquids (ILs) have shown great potential for the dissolution of cellulose. Some ILs also have attractive physical properties such as: low vapor pressure, high thermal stability and reusability. Thus, they are potentially viable and more environmentally friendly alternatives. Hereby, we present and discuss some of the challenges and perspectives for ILs in terms of their potential for cellulose processing. We briefly review the historical processes and current methods for cellulose processing, and look at alternative processes taking advantage of ILs.

Place, publisher, year, edition, pages
New York: Nova Science Publishers, Inc., 2012. 1-34 p.
National Category
Chemical Sciences
Identifiers
URN: urn:nbn:se:umu:diva-48337ISBN: 9781621003496 (print)ISBN: 1621003493 (print)OAI: oai:DiVA.org:umu-48337DiVA: diva2:448631
Available from: 2011-10-17 Created: 2011-10-17 Last updated: 2013-05-03Bibliographically approved
In thesis
1. Ionic liquids in bio-refining: synthesis and applications
Open this publication in new window or tab >>Ionic liquids in bio-refining: synthesis and applications
2013 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Fossil fuel resources are not limitless so alternative renewable recourses are needed to fill the void that inevitably will be created once the supplies of this resource start do dwindle. Biomass has the potential to fill this void. Today only a small part of the world annual production of biomass is utilized by humankind, while the rest is allowed to decay naturally. To utilize this renewable resource in the production of fuel and chemicals, the so called bio-refineries specialized in fractionation and making use of all component of the biomass are needed. Ionic liquids could aid in this task.

Ionic liquids (ILs) have shown great potential in the field of biomass processing in general and in the pretreatment of (ligno)-cellulose in particular. However, a few things need to be addressed before any large-scale processing can be considered: Finding new routes for IL synthesis that make "on-site" production possible; Investigation into the challenges facing IL pretreatment of (ligno)-cellulose such as possible depolymerization of cellulosic material during the pretreatment and investigating what influence different ILs have on the pretreatment of cellulosic material by methods like enzymatic hydrolysis.

This work aims to address these issues and will present a route for IL synthesis making use of alcohols and carboxylic acids both commonly found in a biorefinery. Some of these ILs have also been tested for their ability of dissolve cellulose. Furthermore, this work will address the possibilities but also challenges upon IL-mediated (ligno)-cellulose processing. This includes investigating several ILs and their efficiency as a pretreatment solvent for enzymatic hydrolysis; these studies involve a large variety of different cellulosic materials. This work demonstrated that depolymerization during the IL pretreatment is a possibility and that this can complicate the recovery processes. Furthermore, this work gives guidance into what type of ILs might be suited as pretreatment solvents for different cellulosic materials, including amorphous and crystalline cellulose, processed and native lignocellulose, different types of wood samples and hemicellulose.

Place, publisher, year, edition, pages
Umeå: Umeå universitet, 2013. 104 p.
Keyword
Ionic liquid, Joniska vätskor
National Category
Chemical Sciences
Identifiers
urn:nbn:se:umu:diva-69125 (URN)978-91-7459-655-7 (ISBN)
Public defence
2013-05-30, KBC-huset, KB3B1, Umeå universitet, Umeå, 10:00 (English)
Opponent
Supervisors
Available from: 2013-05-07 Created: 2013-05-03 Last updated: 2013-05-03Bibliographically approved

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